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w. J. o. DOYLE. MULTIPLE BLASTING FUSE.

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UNITED STATES PATENT Fries.

\VILLIAM J. O. DOYLE, OF ASPEN, COLORADO, ASSIGNOR OF ONE-HALF TOTIMOTHY BEOKLEY, OF SAME PLACE.

MULTIPLE BLASTlNG-FUSE.

SPECIFICATION forming part of Letters Patent No. 530,025, dated November27, 1 894. ApplicatiOn filed February 13, 1894. Serial No. 500,044. (Nomodel.)

To all whom, it may concern.-

Be it known that 1, WILLIAM J. O. DOYLE, of Aspen,in the county ofPitkin and State of Colorado, have invented a new and Improved 5Multiple Blasting-Fuse, of which the following is a full, clear, andexact description.

My invention relates to improvements in fuses such as are used forblasting purposes; and the object of my invention is to produce a safetymultiple fuse which is provided with a plurality of waterproof blastingcaps and a series of branch fuses, there being a fuse for each cap, andto arrange the fuses and caps in such a manner that all may bedischarged by lighting a common fuse, and

further to arrange the fuse so that the several branch fuses may beignited and the caps exploded in desired succession, to the end that anydesired number of charges may be exploded with the best possible effect.

To these ends my invention consists of certain features of constructionand combinations of parts, which will be hereinafter described andclaimed. I

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in both views.

Figure 1 is a broken sectional elevation of 0 my improved multiple fuse,showing the arrangement of the branch fuses and blasting caps when aseries of charges are to be exploded; and Fig. 2 is a detail sectionalView, illustrating the manner in which the cap is to 5 be secured to itsfuse.

The fuse is provided with a main fuse 10, of common construction, andextending from this near one end is a series of branch fuses 11 ofdifferent lengths, these leading from op- 40 posite sides of the fuse 10and leading also from different points one above the other. so that theywill be ignited in succession. The

branch fuses may be connected with the main fuse by being plaited to itor they may be 5 connected in any convenient manner, and at the point ofjunction fine black powder is used, as shown at 12, so as to make itcertain that every branch fuse may be ignited from the main or commonfuse 10. It will be understood that anydesired number of these branchfuses may be used and that their lengths may vary according tocircumstances. Each branch fuse 11 terminates at its free end in ablasting, cap 13, which is of the usual construction, except that it isof tapering form, 5 its open end being of greater diameter than theclosed end, and into this cap the end of a fuse is placed, as shown inFig. 2, and 'the space between the fuse and the larger end of the cap isfilled with glue 14 which is permitted to dry and the glue holds the capin place and also makes it waterproof.

When the fuse is to be used, the holes 15 in the rock to be blasted arecharged in the usual way, the caps 13 and branch fuses iusorted in theholes, the shorter fuses being connected with the holes which are to befirst blasted, the tamping 16 is placed around the fuses in the usualway, and the main fuse 10 is ignited. As the fire in the fuse reachesthe branch fuses 11, it will successively ignite them and the caps maybe successively exploded and the charges fired one after the other.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. As an improved article of manufacture,

a multiple blasting fuse, comprising a common or main fuse, and a seriesof branch fuses leading from different parts of the main fuse, eachbranch fuse terminating at its free end in a blasting cap, substantiallyas described.

2. In a blasting fuse comprising the main fuse 10, and a series ofbranch fuses 11 leading from different parts of the main fuse,substantially as described.

WILLIAM J O. DOYLE.

Witnesses:

W. J. LANGSTON, J. H. WILSON.

